x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. The specific resource `/api/v1/stripe/invoices/25` appears to be part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.
The x402 challenge for this particular endpoint advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the platform's stated pricing. Payment is made via the x402 "exact" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout.
The endpoint accepts HTTP POST requests and returns application/json. However, the specific functionality of the `/stripe/invoices/25` resource is not documented in the crawled material — the landing page lists other API categories (analytics, AI, finance, infrastructure) but does not mention Stripe invoice endpoints. No OpenAPI spec, request/response schemas, or detailed documentation were found; the docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Retrieving or generating Stripe invoice data via a single paid API call
- —Programmatic access to invoice information without API key management
- —Agent-driven invoice lookups settled in USDC on Base
Fit
Best for
- —Developers wanting keyless, pay-per-call API access
- —AI agents that can settle x402 payments in USDC on Base
- —Users who need low-friction access without subscriptions or rate limits
Not for
- —Users who need detailed documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/25 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /stripe/invoices/25 resource is undocumented. The docs pages returned only wallet-connect prompts with no content.
Warnings
- —No OpenAPI spec or request/response schema available
- —The specific /api/v1/stripe/invoices/25 endpoint is not listed or documented on the landing page
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content
- —The actual functionality behind this endpoint is unclear — 'Premium API Access' is a generic label
Citations
- —Platform pricing is $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —x402 challenge shows maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/25
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/25
- —Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com